diff --git a/freqtrade/constants.py b/freqtrade/constants.py
index 7bb9895fe..a9b073352 100644
--- a/freqtrade/constants.py
+++ b/freqtrade/constants.py
@@ -260,7 +260,11 @@ CONF_SCHEMA = {
                                      'enum': TELEGRAM_SETTING_OPTIONS,
                                      'default': 'off'
                                      },
-                        'sell': {'type': 'object'},
+                        'sell': {'type': 'object', 
+                            'additionalProperties': {
+                                'type': 'string',
+                                'enum': TELEGRAM_SETTING_OPTIONS
+                            }},
                         'sell_cancel': {'type': 'string', 'enum': TELEGRAM_SETTING_OPTIONS},
                         'sell_fill': {
                             'type': 'string',